RoboMower blades are interchangeable between all RoboMower models. Both high-cut and low-cut blades are available. High-cut blades are the standard shipped with all RoboMowers in the USA but some say the low-cut blades do a better job.
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Friendly Robotics officially says that blades should not be sharpened because if they are off balance they can shorten the life of the cutting motor bearings. Some users sharpen them anyway using a grinder or have them sharpened at their local hardware store.